Tooth development: neonatal line: practice question

A Dentistry question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Dentistry · Tooth development: neonatal line

Sample item

Ground sections of deciduous teeth show an accentuated incremental line in enamel and dentin of teeth mineralising at birth. This neonatal line marks which event?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

B. The physiological stress of birth

The neonatal line is a hypocalcified, accentuated incremental line in enamel (and dentin) formed at birth because of the abrupt change in physiology. It is seen in all deciduous teeth and the first permanent molars, and is used in forensic and anthropological work.

Option by option

  • A. Weaning from breast milk

    Weaning is not linked to a recognised incremental line.

  • B. The physiological stress of birth (correct)

    Correct. The change in metabolic environment at birth leaves this line.

  • C. The first eruption of the tooth into the mouth

    Eruption occurs months later and does not create the neonatal line.

  • D. The start of root formation

    Root formation begins after crown completion and leaves no such line.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Dentistry question

What is the answer to this Dentistry question?

The best answer is B, The physiological stress of birth. The neonatal line is a hypocalcified, accentuated incremental line in enamel (and dentin) formed at birth because of the abrupt change in physiology.

Why is "Weaning from breast milk" not the answer?

Weaning is not linked to a recognised incremental line.

Why is "The first eruption of the tooth into the mouth" not the answer?

Eruption occurs months later and does not create the neonatal line.

Why is "The start of root formation" not the answer?

Root formation begins after crown completion and leaves no such line.

What concept does this question test?

It tests Tooth development: neonatal line in Dentistry. It is seen in all deciduous teeth and the first permanent molars, and is used in forensic and anthropological work.

How hard is this question?

We tag it as a multi-step question: it asks you to combine more than one idea. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Tooth development: neonatal line?

Learn the dental formula, eruption ages and tooth structure once, as tables. Then use the flashcards and the other Dentistry questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.